This page provides information on using the Corona Proxy Exporter with Corona for 3ds Max.
Overview
...
Section
Column
width
55%
Corona Proxy is Chaos Corona's own proxy tool, helpful in decreasing the number of polygons and thereby simplifying meshes for the viewport to keep scenes manageable and to bake objects with animation to keep playback at a reasonable frame rate.
Viewport Visualization Method from left to right: Point Cloud (25%), Solid Bounding Box, Wire Bounding Box, Full Mesh.
For more information about proxy – check Corona Proxy.